The Transactional Outbox Pattern: Reliable Events Without Dual Writes

The complete guide to the transactional outbox pattern: why dual writes lose messages, how to store the event and the business data in a single transaction, a polling relay (FOR UPDATE SKIP LOCKED) and CDC with Debezium (full configuration, event router and slots). Covers per-aggregate ordering, relay scaling, the transactional inbox, retention and partitioning, observability, testing with Testcontainers, event versioning, claim check, multi-tenancy and a complete end-to-end pipeline case study. With production-ready SQL and Python.

36 minutes read

Josué García Puig

2026-07-10

1 views

Verificando acceso...

Loading comments...

Related Resources

Guía

PREMIUM

Cache-Aside in Production: TTLs, Invalidation, and How to Prevent Cache Stampedes

The complete guide to the cache-aside pattern with Redis: jittered TTLs, correct invalidation, and the three defenses against cache stampedes (distributed lock, single-flight, and XFetch). Expanded with stale-while-revalidate, fail-open and circuit breakers, two-tier caching with RESP3 invalidation, delayed double delete and CDC, hot keys, eviction and memory management, observability with Prometheus, testing, choosing an engine (Redis, Valkey, Memcached), and a complete TypeScript implementation. With production-ready code in Python and TypeScript.

Guía

PREMIUM

Circuit Breakers: How to Prevent Cascading Failures in Distributed Systems

Learn to implement the circuit breaker pattern so a failing dependency never drags down your whole system: the three states (closed, open, half-open), sliding failure windows, limited probes to avoid thundering herds, robust fallbacks, and how to combine it with timeouts, retries, and bulkheads. Includes distributed state in Redis, observability with Prometheus, pytest testing, circuit breaking in Envoy/Istio, a full case study, and production-ready code in Python and TypeScript.

Guía

Database Indexing: Designing Indexes and Optimizing Queries in PostgreSQL

Learn to design indexes that genuinely speed up your queries: B-tree, composite, partial, and covering indexes. Includes how to read EXPLAIN ANALYZE, correct column ordering, the mistakes that silently disable an index, and what's new in PostgreSQL 18.